JPS62295110A - Nose r correction controller for nc machining tool - Google Patents

Abstract

PURPOSE:To simplify a program and to eliminate errors by executing the automatic nose R correction according to a move command. CONSTITUTION:A nose R correction controller for NC machining tools is constituted of a CPU 1, an I/O means 2, a position control and drive means 3, a storage means 4 which consists of memories 41-44 and stores NC machining programs and the like, a register means 5, a branch means 6 deciding whether the nose R correction is set up or canceled, a direction discrimination means 7 discriminating the direction of correcting the nose R, and a coordinate arithmetic means 8. In the control part of the NC machining tool, tool file are stored in the memory 42, and features of the tool are indexed by the file. Among many items, groove width, nose R and the tip point of a blade are used for the nose R correction. If data on moving values held at the final stage of the register means 5 passes through the set-up side of the branch means 6 while it is led to the coordinate arithmetic means 8, the nose R correction is added, and the final coordinates in each movement can be calculated.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a nose R correction control device for an NC machine tool,
In particular, the present invention relates to a nose radius correction control device that does not require data input related to nose radius correction during an NC program.

[Conventional technology]

When moving the cutting edge of a tool to a workpiece in an NC machine tool, conventionally there are parts where it is necessary to set up or cancel a program to set up or cancel the nose radius correction of the cutting edge.
The direction of correction had to be determined and programmed, and cancel commands and setup commands had to be incorporated before and after the tool code and work code. FIG. 6 is a diagram showing an example of conventional nose R correction, in which FIG. 7(a) is a cross-sectional view showing machining dimensions for the work W, FIG. 6(b) is an explanatory diagram showing the tool path, and FIG. is the figure (
It is an output sample figure when the NC machining program corresponding to b) is displayed. In Figure (c), the code with G at the beginning of the sentence is a work command with quasi (IWlffi function), for example rGOOJ is a positioning command by rapid traverse, r
GOIJ is a cutting feed command. Codes prefixed with X and Z indicate end point coordinates for movement in the respective axis directions. That is, "GOO" in the first line in figure (C) is
The tool called by the turret index command T○○△△ is placed at the X coordinate of 60.0. This is a command to position by fast forwarding to the position of Z coordinate -4,0. By the way, these coordinate values are programmed using a virtual cutting edge point that considers the cutting edge of the tool as a sharp point, and the actual cutting edge of the tool is a quantitative surface having the required nose radius from the center of the cutting edge of a carbide tip, etc. Therefore, machining work is actually performed on a tangent to that surface, and nose radius correction is required.

[Problem that the invention seeks to solve]

Conventionally, NC machine tools were not equipped with a nose R correction control device, so rG40J was set as a work code requiring nose R correction during the program, as shown in Figure 6(C).
(No correction or correction canceled), rG41
J (Correction to the left in the direction of travel).

It was necessary to set rG42J (correction to cloth in the traveling direction), etc., calculate the correction amount for each tool on site, and input the data into the program each time.

Therefore, the program itself and its processing become complex and diverse, and furthermore, for example, when three moving blocks make a small acute angle (especially when calling a tool), it may stop midway and cause interference when indexing the tool post. If careful attention was not paid, programming errors would occur frequently, necessitating the need for skilled programmers at the NC site.

The present invention solves these problems and provides a nose radius correction control device for an NC machine tool that is easy to program, eliminates mistakes, and is ideal for interactive automatic programming that allows even inexperienced people to easily program. The purpose is to

[Means for solving problems]

In the present invention, means for solving the above-mentioned problems is to automatically correct the nose R of the tool cutting edge based on the NC machining program and tool layout stored in the storage means. A correction control device, comprising a register means for pre-reading and suspending movement command codes and movement value data in an NC machining program for a plurality of movements, and reading the movement command code held in the register means;
branching means that determines set-up or cancellation of nose radius correction according to the contents; and calculating movement direction data from the plurality of movement value data held in the register means, and making it correspond to cutting edge point data based on the tool layout; A direction determining means for determining the nose R correction direction, and calculating end point coordinates of each movement from the nose R correction direction data determined by the direction determining means, the nose R radius according to the tool layout, and the movement value data via the branching means. The present invention provides a nose radius correction control device for an NC machine tool, which is provided with a coordinate calculating means for calculating the coordinates.

[Effect]

In the present invention, the branching means automates the conventional rG404 command, and the direction determining means automates the conventional rG41J command.
and rG42J commands.

While the movement value data held in the final stage of the register means is introduced into the coordinate calculation means, if it passes through the setup side of the branching means, the nose radius correction is added, and if it passes through the canceling side, it remains unchanged, and each The final coordinates of the movement will be calculated.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to examples and drawings thereof.

FIG. 1 is a block diagram showing one embodiment of a nose radius correction control device for an NC machine tool according to the present invention.

In FIG. 1, the nose R correction control device includes a CPU which also serves as a control device for the NC machine tool, and a normal input/output means 2.
and position side 21'J SM moving means 3, NC machining program memory, tool file memory.

Storage means 4 for storing tool layout memory and nose R correction table memory, and NC machining program 1
A register means 5 reads the movement command code and movement value data block by block and pre-reads and holds the movement command code and movement value data for multiple movements.The movement command code held in the register means 5 is read and the nose R correction is performed based on the contents. Branching means 6 determines set-up or cancellation, and movement direction data is calculated from the movement value data of a plurality of times held in the register means 5, and is made to correspond to the cutting edge point data based on the tool layout, and the correction direction of the nose R is calculated. and the coordinates for calculating the end point coordinates of each movement from the nose R correction direction data determined by the direction determining means 7, the nose R radius according to the tool layout, and the movement value data via the branching means 6. It is composed of a calculation means 8.

The memory 4 includes an NC machining program memory 41, a tool file memory 42, and a tool layout memory 4.
3 and a nose R correction table memory 44. The control unit of the NC machine tool has a tool file as shown in the output sample diagram in Figure 2 (a).
stored in the memory 42 and indexed by file;
Gutter width in that item.

The nose R1 cutting edge point is used for nose radius correction.

FIG. 2(b) is an output sample diagram of the tool layout memory 43, which has been edited from the tool file according to the NC machining program for each turret surface of the tool used for machining.

Figure 3(a) shows the nose R correction table memo 1J44.
As explained above, the NC machining program is programmed with a virtual cutting edge point, but the actual tool has a nose radius, and the surface in contact with the workpiece varies depending on the type of tool and the direction of movement. different. For example, if the coordinate system is
As X and Z shown in figure (b), the cutting edge point is the fordrant (quadrant area) shown in the figure with respect to the center O of the nose R in the case of an outer diameter tool, and in the case of an inner diameter tool. Work with the fordrant marked ■ in the diagram. It is this fordrant number that is stored as the cutting edge point among the items in the tool layout memory 43 in FIG. 2(b); TOI is 3 because it is an outer diameter tool, and TO2 is 2 because it is an inner diameter tool. Then, depending on which fordrant this cutting edge point is located, it is determined on which side of the tool movement direction the workpiece is being machined. For example, in Figure 3 (
In c), the correction direction of the tool is to the left with respect to the workpiece W, and in FIG. 3(d), it is to the right. The correspondence relationship between the cutting edge point and the moving direction is stored in the nose R correction table memory 44 shown in FIG. 3(a). 4) and its boundary line (5 to 8), the correction direction of the cutting edge point is indicated by "right" or "left", and "-" indicates that the correction is performed in the same direction as the correction direction of the movement command executed immediately before. It means that.

FIG. 4 is a flowchart showing the operation of the nose R correction control device. The above device will be explained in more detail below, following the flow.

At stage 0 of the fourth leap, the apparatus starts with the nose R correction canceled. A reading command is input at the 0th stage, and the NC machining program is read one block at a time from the NC machining program memo IJ41 into the register means 5 via the AND gate 101.
As the 0th stage of the flow, a movement command (G code) is selected by the selection circuit 50, and the command code and movement value data (X
, Z value) is registered in the first register 51 as a movement command ■ at the 0th stage of the flow. The selection circuit 50 continues to read the program, looks ahead to the next command as the 0th stage of the flow, determines whether it is a movement command or not at the 0th stage, and continues until a movement command is found if it is not a movement command. , and further reads the next command in advance. When a movement command is discovered, it is registered in the first register 51 as a movement command ■ in the 0th stage, and the movement command ■ that had been registered in the first register 51 until then is pushed out and stored from the set memory. The signal passes through the AND gate 102 and is registered in the second register 52. Similarly, when a movement command is found in the 0th stage, 0th stage, it is registered in the first register 51 as a movement command ◎ in the [phase] stage, and the movement commands ■ and ■ are pushed out and sent sequentially. Fill in the registration up to the third register 53.

When the set memory signal indicating that the third register 53 has completed the suspension is input to the AND gate 104 of the branching means 6, the movement command ■ from the second register 52 is allowed to pass through the gate 104, and the flow is changed. As the 0th stage,
In the movement command discrimination circuit 61, the number following G in the command code (
Normally, GOO is used for rapid traverse and GOI to GO3 are used for cutting feed), and if the movement command ■ is rapid traverse, it is sent to AND gate 105, and if it is cutting feed, it is sent to AND gate 105.
Send a signal to gate 106. The movement command from the third register 53 is input to these gates, the AND gate 105 outputs it as cancel data, and the AND gate 106 outputs it as setup data.

Now, the direction determining means 7 in FIG. 1 is constructed by connecting a vector calculation circuit 71 and a determining circuit 72 in series.
Movement value data is inputted from the register means 5, and movement directions for three blocks are read in advance. The calculated movement direction data is sent to the next determination circuit 72. In addition to this, the cutting edge point data from the tool layout memory 43 is input to the discrimination circuit 72, and table memory as shown in FIG. 3(a) is input from the nose radius correction table memory 44. be done. Since the arrow direction is determined by the input from the vector calculation circuit 71, the "right" or "left" nose R correction direction is determined by referring to the table.

The coordinate calculation means 8 includes a nose R correction calculation circuit 81, an OR gate 107, and a nose R correction movement data register 82. If the movement command ■ is cutting feed in the 0th stage of the flow, the movement command ■ is input to the nose R correction calculation circuit 81, but if the movement command ■ is rapid forwarding, the nose R correction is canceled. The movement command (2) is directly input manually to the nose R correction movement data register 82 via the OR gate 107.

When the nose R correction calculation circuit 81 performs a correction calculation, the nose R correction direction data that has been determined by the direction determining means 7 for the 0th stage and the 0th stage of the flow and the tool layout memory 4 are used.
Nose R correction movement data is calculated by adding the nose R correction amount calculated from the direction and radius to the movement data. Therefore, the nose R correction movement data register 82 contains either movement data that has not been corrected for the nose R determined automatically by the branching means 6, or movement data that has been subdivided and corrected for the nose R by the direction judgment by the direction judgment means 7. The data is held, and in the first [phase] of the flow, axis movement is executed based on the coordinate values XR and ZR.

As described above, according to the apparatus of the present invention, the determination of the setup for nose R correction, the determination of the correction direction, the switching, and the calculation are automatically performed, so that the work shown in FIG. b)
The cutting edge can be moved directly from the machine origin to the machining start point as shown in the path ■ shown in Figure 5 (C).
), the correction code such as rG40J can be completely omitted.

〔Effect of the invention〕

As explained above, according to the present invention, by performing automatic nose radius correction based on movement commands, programming is simple, mistakes are eliminated, programming is easy even for unskilled people, and interactive automatic programming is possible. An optimal nose radius correction control device for an NC machine tool can be provided.

[Brief explanation of drawings]

Figure 1 shows the nose radius correction system according to the present invention? FIGS. 2 and 3 are explanatory diagrams of the contents of each memory, FIG. 4 is a flowchart of the embodiment, and FIGS.
The figure is a sample diagram of the tool path and its machining program. 1iCPU. 2; input/output means; 3; position control driving means; 4; storage means; 5; register means; 6; branching means; 7; direction determining means; 8; coordinate calculation means. Patent applicant: Hitachi Seiki Co., Ltd. Figure 3 (Q) Figure 5 (C)

Claims (1)

[Claims] A nose R correction control device for an NC machine tool that automatically corrects the nose R of a tool cutting edge based on an NC machining program and a tool layout stored in a storage means, the device comprising: a movement command code in an NC machining program; register means for pre-reading and suspending movement value data for a plurality of movements;
branching means that reads a movement command code held in the register means and determines whether to set up or cancel the nose radius correction based on the content; and a branching means that calculates movement direction data from the movement value data of a plurality of times held in the register means. , correspond to the cutting edge point data based on the tool layout,
A direction determining means for determining the nose R correction direction, and calculating end point coordinates of each movement from the nose R correction direction data determined by the direction determining means, the nose R radius according to the tool layout, and the movement value data via the branching means. 1. A nose R correction control device for an NC machine tool, characterized in that it is equipped with a coordinate calculating means for calculating the coordinates of a computer.